#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int my_strlen(char a[]) {
	if (*a != '\0') {
		return 1 + my_strlen(a + 1);
	}
	else {
		return 0;
	}

}
int main() {
	char ret[] = "hello world";
	int num = my_strlen(ret);
	printf("%d", num);
	return 0;
}